49cc / 50cc 2 Stroke Motorized Bike 

My first kit after seeing you channel was a legal 49cc kit. It just didn't have any power even after replacing most things on it. I almost threw in the towel but tried a 80cc kit and there is no comparison. It's funny how a 50cc moped or those Chinese motorcycles with 50cc engines can go much faster than a 49cc motorized bike kit. Seeing a real world conversion of one of these to the larger piston and jug might be cool one day.

hi la hover i wanted to share my experience with 49cc kits my first bike had one my top speed was 23mph after break in,my second bike was a raw 49cc it went 29mph put over 7,800 miles on it and it still ran i just retired it,my last one was a old 49cc early 2000s kit it went 28 no problem i feel like its really hit or miss with these but i will say all the older 49cc motors ive had went around 28mph

now I know why some of my kits have that resistance when cranking it by hand

Hi , i made a bike with a 2.3 liter craftsman chainsaw body with a friction set up. It does about 20 mph with a home made exhaust and the tip is from a lawn mower. It runs ok and the face of people seen the chainsaw is worth millions !!! Lol. Now im doing another one using the gears to pick up some speed and make it more quiet with a 26.2 4 stroker. Thanks for the info .👍

Im only 14 this is honestly perfect these little 2 stroke 49 cc kits it was easy enough to install gets me from work to school i plan on upgrading soon lol love the motor bike community

I purchased a BBR 48cc. I did loose some power on hills, but the engine runs amazingly smooth. Is sounds good through all throttle positions. I didn't port match or do a thorough inspection inside. I built it as a starter bike for a young adult. Maybe I just got lucky and got a good one. I will walk him through everything after riding it a little more.

One thing I imagine would really wake up one of these little 49cc engines is a case reed conversion. I'm actually planning on testing that with a spare bottom end I have that uses a beefy GT5 crank with thicker than normal flywheels (38mm stroke). With the intake completely filled and sealed and a 3rd transfer cut, I'll bet that thing gains a lot of bottom end. Couple that with a decent pipe and maybe add just enough exhaust duration to get it to pull up to 8000rpm, and that would be one smooth running little ripper!

I just learned a valuable lesson on why it needs a I ring. I bought a 50 cc china doll ebay engine for my birthday the to build my first bike and put it all together ran it three times. And on the second tank of gas I took a 3 mile ride and had to pedal back after bang big ass hole in the piston and full of debris now oh well time. To upgrade

Brilliant video. So informative and no bullshit at all. Love these little things, so small and fun to tinker with.

Ive bought at least 10 of these 50cc kits(unpainted) for the bikes i sell. Some for as low as $75 and the most ive ever paid is $95. Ive personally had nothing but good luck with them. Start great,run great(after break-in) and all have been reliable as heck! Not as much power uphill as a 66cc or bigger but still not too bad.

Hi LA Hover, just an update on my 49cc, I added 2 more base gaskets on my cylinder block, shaved off 2mm on top of the cylinder block, shaved of the cylinder head (removed the lip and flatten the surface), NT carb with a #66 jet, e-clip at the middle, 20:1 oil gas mix. runs like a charm

Thanks for pointing out the caveats that come with a pre-painted engine. I had no idea that this made such a big difference and that it's why the whole things sits so tight together.. i really thought they would have blocked the inside parts from getting painted..

loving the frequent uploads

I just recently had my first motorized bike stolen off of me. I had a heavy duty steel cable lock but somebody came and used steel bolt cutters to it. They got my pk80 on a Wasaga vagabond frame with the 6cc compression head, a high performance carburetor, boost bottle and an expansion exhaust. It's almost heartbreaking because I got really good at building the engines but I keep having problems with chain alignment. I posted on Facebook for the crime watch group in my area and a few people have seen somebody riding around on one like it but painted it black now it's this pisses me off that he somehow got the chain to work when he stole it the chain wasn't even on the bike I barely got to ride the thing I snapped two chains on it. I don't know if it was because it was the engine and frame alignment, I bought from somebody pre-built but he knew what he was doing. I don't want to give up on this Hobby and my next bike I wanted to work on building a yd 100. I'm just not sure what the best yd 100 is to get?. Is it the Zeda firestorm 100 or is it the bbr racing 100 they're the only two that I can afford right now in limited to $600 Canadian. I'm getting a hyper 26 in cruiser bike and was wondering if that's a good one too. Also a Bell u-bolt level 5 bike lock for it. I just wanted to get some advice on if the hyper cruiser frame is a good bike what would be the best yd 100 and also what kind of security measures can I use. I have a security bike lock that gives off an alarm if you try to cut it I also have one of those vibrational seatpost alarms and I got a magnetic GPS tracker. Now remember I'm Canadian so I'm limited to how I can defend myself. Police don't give a shit in my town either. I called them yesterday morning and they still haven't shown up. On top of that I've had two other people scoping up my girlfriend's e-bike that we've seen on our security camera I already got her that u bolt bike lock level 5 for e bike. Sorry to rant in such a long message it's just you know a lot about the yd100 and those engines and how to keep your bike secure and I'm just kind of venting right now and freaking out over the loss of my first bike and I know you don't know me or have any reason to care but I'd really like your advice on all this. I saw from this video how when you order a bike kit in you clearly need to take it apart and put it back together and re-grease everything to make it run properly and I want to build my next one properly that's the main reason I'm asking your advice.

Cant wait till you re-seat the the crank bearings. As you know that will allow one less case gasket which helps crank crankcase pressure a grip. Ur top dog brother

So I’m thinking about doing my first build. Honestly, my goals for the build will be to learn about small engines and successfully build something that works. I’m thinking about a Firestorm Zeda 80 because of the reviews. I’m worried that all these guys online who clearly know a lot more than me are finding manufacturing issues that I will not have the skills to identify or address.

Got a 50cc kit for my kids bike. She has ridden it quite a bit so it's good and broke in. It does 26 with a 180lb rider. It also has more than enough power to haul my buddy at over 200 lbs over a pretty steep viaduct. Not saying they are all like that but it's possible.

I almost got one because the old chinese mtb I was going to fit it in had a weird inner angle. Thanks for the word on its power. I'm sticking with 66ccs

I got one of these kits. I topped mine out at 38 mph after break in. It wont keep it long but it averages 30 to 32 mph. Idk if its a fluke but im hoping some of the info from this video will help me get that power all the time

I’ve got a bunch of highly modified intake manifolds & carburetors ... jb water weld the velocity stack to the carburetor & fill the thin spots of the carburetor on the outside then port the carburetor to the shape of the velocity stack.. I think the intake manifold bored as big as it can go up top with dimples Works the best .. when I port stuff I like to do it in a bin with warm water .harbor freight flex shaft rotary tool seems pretty quality & works well for rough fast cutting but the dremmel goes faster for polishing & fits in tighter spots.. My bikes been sitting with smoked tires I’ve been hot Roding a bt 200x mini bike & a 70s cat duster chopper 212. & since I live near paradise California I feel my purpose is to restore the biodiversity of the land by digging swales and building ponds.

I like the 50ccs, if you figure out the compression and run a proper 2 stroke pipe it will definitely be usable, I searched around and got a 2 stroke scooter exhaust to install and the little motor finally acted like a refined small engine. They cut to many corners when they paint the motors, ordering a bare metal engine and taking care of the finish is the way to go!

Carburetor o-ring. I was wondering if it should have one.

for my 16 birthday i paid $120 for a 50cc it went about 21 mpa and i am 200 ponds and it was fun but over time the over spray on the Moter wore it out so now a full year later im 17 and building a 80cc with no Pante on the Moter and i have bean a fan of this channel for some time now you are the reason i belt my first bike and the reason im doing it again but for trail riding

I messed around with those China Doll motors for more than a decade 49s 66-80s, even built a 55mm jug and head and running a 28mm pumper carb but the bottom end can't handle it...scrapped it all and groomed a KX 80, reliability, horse power and a real transmission...oh, did I mention HORSEPOWER? I wouldn't suggest putting it in a Walmart bike

You should build a bike with dual 66's! Run two of 'em side-by-side!

I bought a painted 2 stroke motor and it was such a pain in the ass I sold it and got most of my money back. I’m planning to get a 4 stroke bike engine kit for reliability and relatively easier starting

I was given a Viza cruise 33cc motor scooter.. this will be my very first small motor to own...

I have a love/hate relationship with your videos. I love how informative they are but I hate that I might be missing something as I go about my build because I learn some new bit of vital info with every video! Do you have a checklist or comprehensive video where everything is condensed into one place?

I have a 49cc kit it runs fairly on the better side and actually pretty peppy I’m looking into building it up maybe with a mxs head on it look forward to posting some videos on my bike

Well done, i bought a black 50cc kit and the paint it like a thick enamal, and does chip and can get in places you dont want, like the spark plug hole, for one. lol Mine is working well and i got the new version of the carbs as well, but i put the speed carb on my motor. Still at anything over 1/2 throttle is grols or gurgles what ever you want to call it. Four stroking but not sure if that is what it is. I think i need to jet the carb. Tho this carb worked great on my 80cc. I had to raise the clip on the neddle valve all the way to the top, to make it stop four stroking even at low speeds, which is odd again. lol Anyhow thanks man, off to your next vid.

You got your motor running,and headed down the highway.Were you looking for adventure...?

Nice video! Been wondering about these 49cc motors.

I think if I had to buy again I'd spend the extra money and get a 4 stroke engine. Quieter cooler running and look like they are better quality hands down.

I got that same one and raised the exhaust port and got it to 44mph

That looks like it has a decent paint job, the first painted one I bought way back when from Kings Motorbikes looked like it had been dipped in a paint bucket. All that paint is a real pain in the rear too.

I seen how disappointined U were on inspection of the head gasket. Turned your head to side. No biggie tho. Your tops!

Cool little motor. Two Case gaskets big no no. Massive loss of crank volume. That'd be kinda fun to dink around with tho. Just to see how much more power u can get out of it.

Instead converting to a 66cc jug there's a 60cc jug and piston available that is a direct bolt on for the 49cc and adds a little.

I like the that old fashioned petroleum lamp by the window very much.

The ONLY problem I seen throughout this whole video is a small one. You still were using the stock static idler. I learned this from experience that a spring loaded one is infinitely better. I know that you'll probably say that if balance and keep tight the sprocket a static one is fine. But life/shit happens my friend and what can go wrong, will go wrong... eventually. Love your videos so far.

I’m not joking, my first 50cc I got was fast, 30 mph flat. But one of my friends went 38. We tested with a phone GPS, and we even swapped out the cylinder to make sure it was really a 50cc, I’ve never had a slow 50cc Except from a company called panel tech, don’t buy their stuff.

Great video bro good information no 49cc for me lol not enough power

So you also learn from Dragonfly75, good resource!

My bike is not legal but here in michigan you can have it inspected for brakes lights and speed then it can be registered as a moped $30 for registration sticker.. I don't have it but I had a buddy get pulled over on my bike they let him go and I passed about 6 cops riding on the street a few days ago none did anything so I don't think they mind it

I got a couple YD100 Motors from MaxInd. in Florida, and everything on his motors that required grease had it, both Motors were basically ready to go O.O.B., even the innards on the Clutch side were greased up...he does a really nice job on his, haven't had any issues with the one I have on the Gasbike Frame from CDH...nice, tight little motor so far...

Here in California we can’t even buy motorized engines on Amazon anymore I’m surprised I can still buy them too be honest with you

i had a black 50cc like that one and it had a good amount of power

You should check out tge videos of Soviet 50cc motobicycles (they called them "Durchik) Riga 7, Riga 11, Riga 13 etc

The painted motors are a result of whatever company's particular process. We cant assume all components or assembly is done in one building or linearly fluid. Individual components produced in several different small operations and shelf time mean for them the cheapest way to make sure yoi dont recieve a solid block of rust is to seal in paint asap after casting etc. Very much being a case ofnyou get what you pay for, the cheaper price will almost always dictate the buyer essentially becomesntesponsible for finishing properly. My only gripe is that this should be expressed up front to the customer in marketing or ay least come with some paperwork or manual that explains finsihing and prep prior to assembly

The money you saved on a product from China requires that you perform all the quality control procedures that were never applied.

I built a 2nd bike with a 50cc after my 1st 66cc build & two rides later im selling it as I live on a hill and I am not very fit lol

Ya look kinda cool bra. Is that a drone following you?

Have you had an engine that lost power as it got to operating temperature, and runs hot? Mainly the hot running issue.

and here i thought you could just slap one of these on a bike and go...

Don’t you have to engage the clutch before trying to turn the motor over by hand? Not being rude or anything but I thought u had to do that when turning it over to check compression.

I really want a motorized bike, yet don't have the space or time for such in-depth work to get it running smooth, which means I won't be able to have one unless I can find someone with the specific knowledge, space, and inclination to do the work for me. Perhaps there are businesses who will do this work? Thank you for the video, so far among the most thorough, and clear, that I have seen.

You might asswell just put on 49 cc sticker on a 100 or 80 cc 50 will bearly face slight hills you'll need that power but if you new to engines abd want to learn then go for it. .

Another we'll done 🚲💨💨💨💨 video thanks 💨💨🤙👍💯

How come mine doesnt start like that? Got spark got fuel got compression?!? Im Giving up on it

You know what I would like I need help with my 80cc it's started at once it was weak and I can't get it started again

I've been going back and forth on what size and I'll probably go with a 49cc just because. If I want to go faster I'll jump on one of my motorcycles.

I like this video this is like the Kit I got for my first bike

I have the firestorm zeda80(triple 40) it came with that newer style carb and I actually really like mine.

you could put a bigger sprocket on the back wheel

Great video!

please link the next episode in the description or somewhere.

That’s actually awesome I have a road bike bet that would move alright.

Good video

This is similar to the first engine I used. I was (and still am) paranoid about being legal. But I got everything I could out of that engine. Lol I didn’t have a chain to the pedals so it did do pulls from 0 but slowly

thanks for the tip on the rings

13:17 draw filing is for flat surfaces

how did you spray paint the frame? with the stickers or did you take the stickers off

When i put mine spark plug in my bike pedals very heavy

My motor is a 50cc. I have ridden it bone stock and slightly modified and as far as performance goes i personally on my own setup and use case find a poo poo pipe helps give it some more power. Its not faster but it definitely has a noticeable powerband now. I am by no means an expert butI hope this helps anybody.

Can you please explain what you mean by 'squish gap', regards from Ireland 🇮🇪.

why fill with JB Weld, screw that aluminum screw into the hole tightly cut it off flush and sand it smooth center punch the bolt then remeasure an drill you can rejoin broken metal parts as long as you can zip using overlapping screws screwed as close together then in the small gap between drill and thread another screw hole that cuts the side of the 2 screws locking them tight can run vertical, horizontal, and diagonal

Can I tap and drill the holes on my 50cc ,2 stoke

the one advantage I see in these 49cc 2 stroke kits is that they have minimal vibrations even on WOT. By the way, what oil to fuel ratio did you use?did you change the jets in the carb?

What are 4 stroke motors like in terms of quality out of the box?

Please clean those Bering races that will help you so much with that little motor. It looks pretty gutless lol on Amazon.Ca the 50cc is more pricy than the 66/80 and sometimes the big bore motors. 😂😂🤣🤣

Was that new carb with the Oring a really loose fit?? i noticed on my YD100 the carb is really loose on the intake stem, i have to seal the hell outta it and really crank it tight to barely seal,, nice vid man

the bike looks awesome at least

Man has taught us many life lessons. Especially finger checking for looseness. All jokes aside I loved this vidoe

You have to run Lucas 30 weight oil and you also have to run through it with the magnese oil of breaking oil of two-cycle and it wants all that happens the bike was breaking down at runs really good but the Piston knocks but I'm taking that thing from like three times four towns away to go meet a buddy totally reliable so don't be bashing on those little 49ers they're pretty good

I want to do something similar But I want to attach the Motor to the front gear On the bicycle With an extra sprocket on the left side So that way I can Use the gear shifting ratio To work like a transmission So I can hit higher speeds But Use a pull start type motor Like a weedwacker or a chainsaw And even though they might be slightly louder I'm honestly okay with that

change the head. that compression is like 6:1. that's ridiculous. I'm telling you, that head is for a domed piston. you get the right head for that, you're going to see twice the power. no lie.💯

actually getting one of these for legal reasons is the exact reason they sell one 50cc and under. they can arrest u all they want but when u go to court, u win.

They'd use a syringe measured to 49cc and inject into the combustion chamber at tdc. Also something police are not doing

Looks like a lot of work just to get the engine running like its supposed to

I use an 80cc. Cheap no-name Chinese engine. conquers hills just fine, and I slapped a 49cc sticker on it.

First of all, my state has a FORTY EIGHT cc limit, which is what these engines are. That law was designed specifically for these engines. A 49cc engine is not technically legal, though I have one on my friction drive setup. But I also avoid attracting attention by staying under the 20 mph speed limit for motorized bicycles, and not making a lot of noise. I also wear a white helmet and a neon green vest that no punk kid with a highly illegal setup would be caught dead wearing.

I would carry the receipt in other paperwork that came with the kit the same as I would a vehicle registration. Are the BBR 49cc 2strokes good kits?

can someone help me figure out where to get a crankshaft for the black 50cc motor? the magneto bolt stripped along with the crank for some odd reason, the threads were just laying inside

the 49cc lack the HP (horsepower) on inclines, to say the least. The 80cc have the strong HP on inclines.

Adding a motor to a bicycle converts it into a moped (short for motor-pedal bicycle).

4:10 I needed to change my clutch. I saw that this pin on my motor appears off center and doesn't wiggle. It doesn't move at all. Is that indicative of a problem?

How would you winterized one of these motor kit? Reason why I am asking is because I use this as an everyday vehicle

Anyone know how to make them quiet enough that cops won't bother me? I've seen some ideas about customizing the intake and exhaust. Any help will be much appreciated. I am doing a motorized bicycle powered lawn service with custom bicycle trailer.

Can you explain your gas mix? Your engine had no smoke

If I get pulled over for no helmet or license plate. Sorry officer. I'm riding a bicycle that is transporting a engine.